Duction
{{Short description|Anatomical term for eye movements}}
{{redirects|-duction|the terms of logic ending in this suffix|inductive reasoning}}
A duction is an eye movement involving only one eye.Kanski, JJ. Clinical Ophthalmology: A Systematic Approach. Boston:Butterworth-Heinemann;1989. There are generally six possible movements depending upon the eye's axis of rotation:
Forced duction test
The forced duction test is performed in order to determine whether the absence of movement of the eye is due to a neurological disorder or a mechanical restriction.[http://www.biology-online.org/dictionary/Forced_duction Forced duction - definition from Biology-Online.org]
The anesthetized conjunctiva is grasped with forceps and an attempt is made to move the eyeball in the direction where the movement is restricted. If a mechanical restriction is present, it will not be possible to induce a passive movement of the eyeball.Kunimoto D, Kanitkar K & Makar M. The Wills Eye Manual. Office and Emergency Room Diagnosis and Treatment of Eye Disease. Fourth Edition. Lippincott Williams & Wilkins; 2004
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